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How to prevent MongoDB from returning the object ID while finding a document?
To prevent MongoDB from returning the Object ID while finding a document, you need to set _id to 0. Let us first create a collection with documents
> db.preventObjectIdDemo.insertOne(
... {
...
... "StudentName" : "Chris",
... "StudentDetails" : [
... {
... "StudentTotalScore" : 540,
... "StudentCountryName" : "US"
... },
... {
... "StudentTotalScore" : 489,
... "StudentCountryName" : "UK"
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5ca20a9c66324ffac2a7dc63")
}Following is the query to display all documents from a collection with the help of find() method
> db.preventObjectIdDemo.find().pretty();
This will produce the following output
{
"_id" : ObjectId("5ca20a9c66324ffac2a7dc63"),
"StudentName" : "Chris",
"StudentDetails" : [
{
"StudentTotalScore" : 540,
"StudentCountryName" : "US"
},
{
"StudentTotalScore" : 489,
"StudentCountryName" : "UK"
}
]
}Following is the query to prevent MongoDB from returning the Object ID when finding a document
> db.preventObjectIdDemo.find({ _id: ObjectId("5ca20a9c66324ffac2a7dc63")},
{StudentDetails: { $slice: [0, 1] } ,'_id': 0} ).pretty();The following is the output where ObjectID isn’t visible
{
"StudentName" : "Chris",
"StudentDetails" : [
{
"StudentTotalScore" : 540,
"StudentCountryName" : "US"
}
]
}
Updated on: 30-Jul-2019
429 Views
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